Fix a bug in the statistics when using TH1::Add for normalize histogram with the bin volume:      TH1::Add(h1,h1,c1,-1) The statistics of the shitogram needs to be re-computed in that case
Fix a bug in the statistics when using TH1::Add for normalize histogram with the bin volume: 
    TH1::Add(h1,h1,c1,-1)
The statistics of the shitogram needs to be re-computed in that case


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@42299 27541ba8-7e3a-0410-8455-c3a389f83636

bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT,bbannier/ROOT